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-   -   [snappyHexMesh] Unexpected EOF while reading dictionary entry (https://www.cfd-online.com/Forums/openfoam-meshing/252235-unexpected-eof-while-reading-dictionary-entry.html)

MohdShaeq October 5, 2023 15:50
Unexpected EOF while reading dictionary entry
 
Hello respected members of the OpenFOAM community,

I am trying to mesh an engine and for that I have modified the snappyHexMeshDict accordingly. But it shows the following error on being run:-

Unexpected EOF while reading dictionary entry

The snappyHexMeshDict is as follows:-

Code:
/*--------------------------------*- C++ -*----------------------------------*\
| =========                |                                                |
| \\      /  F ield        | OpenFOAM: The Open Source CFD Toolbox          |
|  \\    /  O peration    | Version:  v1912                                |
|  \\  /    A nd          | Website:  www.openfoam.com                      |
|    \\/    M anipulation  |                                                |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version    2.0;
    format      ascii;
    class      dictionary;
    object      snappyHexMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

// Which of the steps to run
castellatedMesh true;
snap            true;
addLayers      true;

// Geometry. Definition of all surfaces. All surfaces are of class
// searchableSurface.
// Surfaces are used
// - to specify refinement for any mesh cell intersecting it
// - to specify refinement for any mesh cell inside/outside/near
// - to 'snap' the mesh boundary to the surface
geometry
{
        Ansaugrohr // STL filename
        {
                type triSurfaceMesh;
                file "Ansaugrohr.stl";
        }

        Auslass // STL filename
        {
                type triSurfaceMesh;
                file "Auslass.stl";
        }

        Basalkruemmer // STL filename
        {
                type triSurfaceMesh;
                file "Basalkruemmer.stl";
        }

        Brennkammerprofil_aeusseres // STL filename
        {
                type triSurfaceMesh;
                file "Brennkammerprofil_aeusseres.stl";
        }

        Brennkammerprofil_inneres // STL filename
        {
                type triSurfaceMesh;
                file "Brennkammerprofil_inneres.stl";
        }

        Duese // STL filename
        {
                type triSurfaceMesh;
                file "Duese.stl";
        }

        Einlass // STL filename
        {
                type triSurfaceMesh;
                file "Einlass.stl";
        }

        InjektorFluidkammer // STL filename
        {
                type triSurfaceMesh;
                file "InjektorFluidkammer.stl";
        }

        InjektorFluidvolumen // STL filename
        {
                type triSurfaceMesh;
                file "InjektorFluidvolumen.stl";
        }

        Nadel // STL filename
        {
                type triSurfaceMesh;
                file "Nadel.stl";
        }
}

        /*        regions
                {
                        Ansaugrohr {name Ansaugrohr; }
                        Auslass {name Auslass; }
                        Basalkruemmer {name Basalkruemmer; }
                        Brennkammerprofil_aeusseres {name Brennkammerprofil_aeusseres; }
                        Brennkammerprofil_inneres {name Brennkammerprofil_inneres; }
                        Duese {name Duese; }
                        Einlass {name Einlass; }
                        InjektorFluidkammer {name InjektorFluidkammer; }
                        InjektorFluidvolumen {name InjektorFluidvolumen; }
                        Nadel {name Nadel;  }
                }
        }
        Verfeinerungszylinder
        {
                type searchableCylinder; // region defined by bounding cylinder
                point1 (0 0 -0.027) ; // location of the cente at the bottom
                point2 (0 0 0) ; // location of the center at the top
                radius 0.0020; // radius of the cylinder
        }
        Verfeinerungskasten
        {
                type searchableBox; // region defined by bounding box
                min (-0.075 -0.065 -0.145);
        max ( 0.065  0.07 -0.004);
        }
        */

// Settings for the castellatedMesh generation.       
castellatedMeshControls                //sub-dictionary of controls for castellated mesh.
{
        // Refinement parameters
            // ~~~~~~~~~~~~~~~~~~~~~

            // If local number of cells is >= maxLocalCells on any processor
            // switches from from refinement followed by balancing
            // (current method) to (weighted) balancing before refinement.
        maxLocalCells 1000000; //100000;
       
        // Overall cell limit (approximately). Refinement will stop immediately
          // upon reaching this number so a refinement level might not complete.
            // Note that this is the number of cells before removing the part which
            // is not 'visible' from the keepPoint. The final number of cells might
            // actually be a lot less.
        maxGlobalCells 10000000; //1000000;
       
        // The surface refinement loop might spend lots of iterations refining just a
            // few cells. This setting will cause refinement to stop if <= minimumRefine
            // are selected for refinement. Note: it will at least do one iteration
            // (unless the number of cells to refine is 0)
        minRefinementCells 10; //10;
       
        // Allow a certain level of imbalance during refining
            // (since balancing is quite expensive)
            // Expressed as fraction of perfect balance (= overall number of cells /
            // nProcs). 0=balance always.
        maxLoadUnbalance 0.10;
       
        // Number of buffer layers between different levels.
          // 1 means normal 2:1 refinement restriction, larger means slower
          // refinement.
        nCellsBetweenLevels 1;


        // Explicit feature edge refinement
        // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

        // Specifies a level for any cell intersected by its edges.
    // This is a featureEdgeMesh, read from constant/triSurface for now.
        features
        (
                {
                file "Ansaugrohr.eMesh";
                level 0; //4; //5; //6
                }
                {
                file "Auslass.eMesh";
                level 6; //4; //5; //6
                }
                {
                file "Basalkruemmer.eMesh";
                level 0; //4; //5; //6
                }
                {
                file "Brennkammerprofil_aeusseres.eMesh";
                level 0; //4; //5; //6
                }
                {
                file "Brennkammerprofil_inneres.eMesh";
                level 6; //4; //5; //6
                }
                {
                file "Duese.eMesh";
                level 1; //4; //5; //6
                }
                {
                file "Einlass.eMesh";
                level 6; //4; //5; //6
                }
                {
                file "InjektorFluidkammer.eMesh";
                level 6; //4; //5; //6
                }
                {
                file "InjektorFluidvolumen.eMesh";
                level 6; //4; //5; //6
                }
                {
                file "Nadel.eMesh";
                level 6; //4; //5; //6
                }
        );

        // Surface based refinement
            // ~~~~~~~~~~~~~~~~~~~~~~~~

            // Specifies two levels for every surface. The first is the minimum level,
            // every cell intersecting a surface gets refined up to the minimum level.
            // The second level is the maximum level. Cells that 'see' multiple
            // intersections where the intersections make an
            // angle > resolveFeatureAngle get refined up to the maximum level.

        refinementSurfaces
        {
                Ansaugrohr
                {
                // Surface - wise min and max refinement level
                level (0 0);
                }

                Auslass
                {
                // Surface - wise min and max refinement level
                level (6 6);
                }

                Basalkruemmer
                {
                // Surface - wise min and max refinement level
                level (0 0);
                }

                Brennkammerprofil_aeusseres
                {
                // Surface - wise min and max refinement level
                level (0 0);
                }

                Brennkammerprofil_inneres
                {
                // Surface - wise min and max refinement level
                level (6 6);
                }

                Duese
                {
                // Surface - wise min and max refinement level
                level (1 1);
                }

                Einlass
                {
                // Surface - wise min and max refinement level
                level (6 6);
                }

                InjektorFluidkammer
                {
                // Surface - wise min and max refinement level
                level (6 6);
                }

                InjektorFluidvolumen
                {
                // Surface - wise min and max refinement level
                level (6 6);
                }

                Nadel
                {
                // Surface - wise min and max refinement level
                level (6 6);
                }


                /*regions
                        {
                        Ansaugrohr {level (1 1); patchInfo {type wall; }}
                        Auslass {level (6 6); patchInfo {type patch; }}
                        Basalkruemmer {level (1 1); patchInfo {type wall; }}
                        Brennkammerprofil_aeusseres {level (1 1); patchInfo {type wall; } }
                        Brennkammerprofil_inneres {level (6 6); patchInfo {type wall; } }
                        Duese {level (2 2); patchInfo {type wall; }}
                        Einlass {level (6 6); patchInfo {type patch; }}
                        InjektorFluidkammer {level (6 6); patchInfo {type wall; }}
                        InjektorFluidvolumen {level (6 6); patchInfo {type wall; }}
                        Nadel {level (6 6); patchInfo {type wall; }}
                        }
                */


        // Resolve sharp angles
        resolveFeatureAngle 30;
       
        // Region-wise refinement
            // ~~~~~~~~~~~~~~~~~~~~~~

            // Specifies refinement level for cells in relation to a surface. One of
            // three modes
            // - distance. 'levels' specifies per distance to the surface the
            //  wanted refinement level. The distances need to be specified in
            //  descending order.
            // - inside. 'levels' is only one entry and only the level is used. All
            //  cells inside the surface get refined up to the level. The surface
            //  needs to be closed for this to be possible.
            // - outside. Same but cells outside.

           
    /* refinementRegions
        {
              Einlass
                {
                mode inside;
            levels (1 2);
                }
        }
        */
               
        // Mesh selection
        // ~~~~~~~~~~~~~~

            // After refinement patches get added for all refinementSurfaces and
            // all cells intersecting the surfaces get put into these patches. The
            // section reachable from the locationInMesh is kept.
            // NOTE: This point should never be on a face, always inside a cell, even
            // after refinement.
        locationInMesh (0 0 0); // Inside Point

        // Outside Point (external Mesh)(40  40 55) ; // Inside Point //(0 0 0); // Outside Point (external Mesh)
       
        // Whether any faceZones (as specified in the refinementSurfaces)
            // are only on the boundary of corresponding cellZones or also allow
            // free-standing zone faces. Not used if there are no faceZones.
            allowFreeStandingZoneFaces true;
        }
 
 // Settings for the snapping.
 snapControls
 {
        //- Number of patch smoothing iterations before finding correspondence
    //  to surface
        nSmoothPatch 3;

        //- Relative distance for points to be attracted by surface feature point
    //  or edge. True distance is this factor times local
    //  maximum edge length.
        tolerance 2.0;

        //- Number of mesh displacement relaxation iterations.
        nSolveIter 30;

        //- Maximum number of snapping relaxation iterations. Should stop
    //  before upon reaching a correct mesh.
        nRelaxIter 5;

        // Feature snapping

                //- Number of feature edge snapping iterations.
        //  Leave out altogether to disable.
                nFeatureSnapIter 10;

                // - Detect ( geometric only ) features by sampling the surface
                // ( default = false ).
                implicitFeatureSnap false ;

                // - Use castellatedMeshControls :: features ( default = true )
                explicitFeatureSnap true ;

                // - Detect points on multiple surfaces ( only for explicitFeatureSnap )
                multiRegionFeatureSnap true ;
 }
 
 addLayersControls
{
    // Are the thickness parameters below relative to the undistorted
    // size of the refined cell outside layer (true) or absolute sizes (false).
    relativeSizes true;

    // Per final patch (so not geometry!) the layer information
    layers
    {
      Geometrie
      {
                  nSurfaceLayers 1;
          }
    }

    // Expansion factor for layer mesh
    expansionRatio 1.0;

    // Wanted thickness of final added cell layer. If multiple layers
    // is the thickness of the layer furthest away from the wall.
    // Relative to undistorted size of cell outside layer.
    // See relativeSizes parameter.
    finalLayerThickness 0.3;

    // Minimum thickness of cell layer. If for any reason layer
    // cannot be above minThickness do not add layer.
    // Relative to undistorted size of cell outside layer.
    minThickness 0.1;

    // If points get not extruded do nGrow layers of connected faces that are
    // also not grown. This helps convergence of the layer addition process
    // close to features.
    // Note: changed(corrected) w.r.t 1.7.x! (didn't do anything in 1.7.x)
    nGrow 0;

    // Advanced settings

    // When not to extrude surface. 0 is flat surface, 90 is when two faces
    // are perpendicular
    featureAngle 60;

    // At non-patched sides allow mesh to slip if extrusion direction makes
    // angle larger than slipFeatureAngle.
    slipFeatureAngle 30;

    // Maximum number of snapping relaxation iterations. Should stop
    // before upon reaching a correct mesh.
    nRelaxIter 3;

    // Number of smoothing iterations of surface normals
    nSmoothSurfaceNormals 1;

    // Number of smoothing iterations of interior mesh movement direction
    nSmoothNormals 3;

    // Smooth layer thickness over surface patches
    nSmoothThickness 10;

    // Stop layer growth on highly warped cells
    maxFaceThicknessRatio 0.5;

    // Reduce layer growth where ratio thickness to medial
    // distance is large
    maxThicknessToMedialRatio 0.3;

    // Angle used to pick up medial axis points
    // Note: changed(corrected) w.r.t 1.7.x! 90 degrees corresponds to 130
    // in 1.7.x.
    minMedialAxisAngle 90;


    // Create buffer region for new layer terminations
    nBufferCellsNoExtrude 0;


    // Overall max number of layer addition iterations. The mesher will exit
    // if it reaches this number of iterations; possibly with an illegal
    // mesh.
    nLayerIter 50;
}



// Generic mesh quality settings. At any undoable phase these determine
// where to undo.

 meshQualityControls
{
    #include "meshQualityDict"

        maxNonOrtho 65;
    maxBoundarySkewness 20;
    maxInternalSkewness 4;
    maxConcave 80;
    minVol 1e-18;
    minTetQuality 1e-9;
    minArea -1;
    minTwist 0.05;
    minDeterminant 0.001;
    minFaceWeight 0.05;
    minVolRatio 0.01;
    minTriangleTwist -1;

        /*
        // Optional : some meshing phases allow usage of relaxed rules.
    // See e.g. addLayersControls::nRelaxedIter.
    relaxed
    {
        //- Maximum non-orthogonality allowed. Set to 180 to disable.
        maxNonOrtho 75;
    }

    // Advanced

    //- Number of error distribution iterations
    nSmoothScale 4;
    //- Amount to scale back displacement at error points
    errorReduction 0.75;
        */

    // Advanced
    nSmoothScale 4;
    errorReduction 0.75;

    relaxed
    {
        maxNonOrtho 55;
    }

    //- Number of error distribution iterations
    nSmoothScale 4;
    //- Amount to scale back displacement at error points
    errorReduction 0.75;
 
}


// Write flags
writeFlags
(
    scalarLevels        // write volScalarField with cellLevel for postprocessing
    layerSets                // write cellSets, faceSets of faces in layer
    layerFields    // write volScalarField for layer coverage
);


// Merge tolerance. Is fraction of overall bounding box of initial mesh.
// Note: the write tolerance needs to be higher than this.
mergeTolerance 1e-6;


// ************************************************************************* //

I kindly request you to point out the mistakes I have made or changes that I should make. I would be highly grateful for your kind help.

Best regards,
Mohd Shaeq

olesen October 5, 2023 18:35
likely one of your c-style comments is not ending where you think it is (eg, a missing terminator).
Your first approach for debugging this is to use a good editor and set as c/c++ mode. Then try to see that all of your open braces/brackets have a corresponding closure. It should also highlight the comments in a different colour, which makes it easier to spot mistakes.
If you want to block out a large chunk of input, it can sometimes be useful to stick those sections into separate files and then #include them (or not). Can also use #if 0 / #endif to disable a section of code (I think that works in v1912).
Finally, before running snappy and discovering an error, you can also use foamDictionary -expand on the file to verify that the input is indeed what you expected to have.


Don't panic, you'll find the problem soon enough!

MohdShaeq October 6, 2023 01:59
Thank you for your kind assistance, Mark. I had forgotten a closing bracket and by typing it I was able to solve the problem.


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